Toshiba e-STUDIO200L Service Manual page 298

5) Fuser unit error status counter control
- To enhance the safety of the fusing section unit, engine-CPU provides the following protection:
When the third [C410] error has occurred after two consecutive [C410] errors, the heater lamp is
not turned ON and error [C410] is displayed immediately even if an operator turns OFF the
power and back ON. However, if the equipment goes into a ready state normally with the fuser
unit error status counter "1" or below, the counter is cleared to "0".
- If the error codes [C410] to [C450] are displayed and still not cleared even though the thermistor,
thermostat and heater lamp have been repaired (and the power ON/OFF does not clear the
error), check the Setting Mode (08-400) to set the fuser unit error status counter to "0".
Remark:
The fuser unit error status counter (Setting Mode (08-400)) never has values other than 0-9.
• If the heater lamp does not turn ON and the service call [C410] is displayed immediately after
the power is ON, ensure the fuser unit error status counter is "2" or over. If it is "2" or over, be
sure to check the thermistor, thermostat and heater lamp. Reset the counter to "0" after repair-
ing them, then turn ON the power.
• If the fuser unit error status counter is "10" or over (e.g., 21), the data in NVRAM or NVRAM
itself may possibly have been ruined due to causes such as leakage from the chargers.
Check the bias, high-voltage transformers and charge wires to see if any of them is defective,
and also look through all the data in the NVRAM.
• When the thermistors detect overheating, the engine-CPU decides the error code and
counter value of the fuser unit error status. After turning OFF each output (the heater lamp,
exposure lamp, control panel display, motors and so on), the engine-CPU turns OFF the
power to protect the fuser unit.
Error code: C440 ([C] and [8])
Counter value of the fuser unit error status: 9 (08-400)
Thermistors continue detecting the abnormal temperature even after the error codes and
counter values are decided. Even if the power is turned ON immediately, it is automatically
turned OFF again when the surface temperature of the fuser roller is still higher than the
abnormal temperature detected.
Wait until the surface temperature of the fuser roller is lowered enough, and turn ON the
power to check the counter value while it is turned OFF again. After confirming that it is the
fuser unit abnormality, correct the abnormality and reset the counter value (08-400) to "0" to
start up the equipment normally.
e-STUDIO200L/202L/203L/230/232/233/280/282/283
FUSER UNIT
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